We recently had a glorious trip to South Cornwall. Lots of good food, rest, coastal walks, fresh sea air and sunshine. So good for the soul!
Highly recommend staying at The Rosevine. It's a fab family hotel with a swimming pool, kids' room, table tennis, great food, comfy beds, separated kids' bunk room within your suite and it's a few minutes walk to Porthcurnick Beach, The Hidden Hut (a very cool beack cafe), and a walk along the coast path to Portscatho.
Even managed to get in a coastal plank (obviously...).